Figure REF  shows calculated bound states for \(s\)  and \(d\) 
levels on a broader energy scale. (Levels with other symmetries
are not shown). A DVR calculation with a full \(sd\)  basis is
possible in this case. The \(6s(6)\)  and \(4d(4)\)  uncoupled
levels show two crossings.
The low-field crossing around 0.24 mT occurs near the
observed location (0.72 mT) of a three-body Borromean state
of the Cs\(_3\)  trimer associated with the exotic Efimov physics
of this species [1]}. Lee et
al. [2]} used the last two \(6s(6)\)  two-body states
of the Cs\(_2\)  dimer to construct the parameters for full
three-body calculations of bound states and recombination
coefficients in the 0 mT to 3 mT range. While their method was
able to give semi-quantitative agreement with the measurements,
the avoided crossing of the \(6s(6)\)  level with the \(4d(4)\) 
level needs to be taken into account in subsequent calculations
because of the mixed spin character of the target molecular
state produced by the three-body recombination in this region
of \(B\) . The strong \(s-d\)  interactions modify the \(s\) -wave
scattering length at small \(B\) , but this is easy to take into
account by including \(s\)  and \(d\)  basis functions in scattering
calculations.
